Comparing the Properties of GMCs in M33 from Simulations and Observations

Abstract

We compare the properties of clouds in simulated M33 galaxies to those observed in the real M33. We apply a friends of friends algorithm and CPROPS to identify clouds, as well as a pixel by pixel analysis. We obtain very good agreement between the number of clouds, and maximum mass of clouds. Both are lower than occurs for a Milky Way-type galaxy and thus are a function of the surface density, size and galactic potential of M33. We reproduce the observed dependence of molecular cloud properties on radius in the simulations, and find this is due to the variation in gas surface density with radius. The cloud spectra also show good agreement between the simulations and observations, but the exact slope and shape of the spectra depends on the algorithm used to find clouds, and the range of cloud masses included when fitting the slope. Properties such as cloud angular momentum, velocity dispersions and virial relation are also in good agreement between the simulations and observations, but do not necessarily distinguish between simulations of M33 and other galaxy simulations. Our results are not strongly dependent on the level of feedback used here (10 and 20%) although they suggest that 15% feedback efficiency may be optimal. Overall our results suggest that the molecular cloud properties are primarily dependent on the gas and mass surface density, and less dependent on the localised physics such as the details of stellar feedback, or the numerical code used.

arXiv comment15 pages, 12 figures, accepted by MNRAS

References in corpus (48)

• The Star Formation Law in Nearby Galaxies on Sub-Kpc Scales
• Modelling Accretion in Protobinary Systems
• Star Formation and Feedback in Smoothed Particle Hydrodynamic Simulations--I. Isolated Galaxies
• Star Formation in NGC 5194 (M51a). II. The Spatially-Resolved Star Formation Law
• Bias-free Measurement of Giant Molecular Cloud Properties
• Star Formation in Disk Galaxies. I. Formation and Evolution of Giant Molecular Clouds via Gravitational Instability and Cloud Collisions
• Gasoline2: A Modern SPH Code
• The PdBI Arcsecond Whirlpool Survey (PAWS): Environmental Dependence of Giant Molecular Cloud Properties in M51
• The PdBI Arcsecond Whirlpool Survey (PAWS). I. A Cloud-Scale/Multi-Wavelength View of the Interstellar Medium in a Grand-Design Spiral Galaxy
• Giant Molecular Clouds in M33 - I. BIMA All Disk Survey
• Cloud-Scale Molecular Gas Properties in 15 Nearby Galaxies
• CO-dark gas and molecular filaments in Milky Way type galaxies
• A Comparative Study of Giant Molecular Clouds in M51, M33 and the Large Magellanic Cloud
• The Exciting Lives of Giant Molecular Clouds
• The properties of the ISM in disc galaxies with stellar feedback
• Molecular and Atomic Gas in the Local Group Galaxy M33
• A parsec-resolution simulation of the Antennae galaxies: Formation of star clusters during the merger
• GMC formation by agglomeration and self gravity
• The Star Formation Efficiency per Free Fall Time in Nearby Galaxies
• Orbits of Massive Satellite Galaxies: I. A Close Look at the Large Magellanic Cloud and a New Orbital History for M33
• Giant Molecular Clouds in the Local Group Galaxy M33
• The frequency and nature of `cloud-cloud collisions' in galaxies
• A Portrait of Cold Gas in Galaxies at 60pc Resolution and a Simple Method to Test Hypotheses That Link Small-Scale ISM Structure to Galaxy-Scale Processes
• A 50 pc scale view of star formation efficiency across NGC 628
• Graph-based interpretation of the Molecular Interstellar Medium Segmentation
• First Gaia Dynamics of the Andromeda System: DR2 Proper Motions, Orbits, and Rotation of M31 and M33
• From molecules to Young Stellar Clusters: the star formation cycle across the M33 disk
• Particularly Efficient Star Formation in M33
• Dynamical signatures of a LCDM-halo and the distribution of the baryons in M33
• The ALMA view of GMCs in NGC 300: Physical Properties and Scaling Relations at 10 pc Resolution
• What can simulated molecular clouds tell us about real molecular clouds?
• The Varying Mass Distribution of Molecular Clouds Across M83
• Kinematics of the Atomic ISM in M33 on 80 pc scales
• The Core Mass Function in the Massive Protocluster G286.21+0.17 revealed by ALMA
• Physical properties and scaling relations of molecular clouds: the effect of stellar feedback
• The evolution of Giant Molecular Filaments
• Properties and rotation of molecular clouds in M 33
• Simulations of the flocculent spiral M33: what drives the spiral structure?
• A statistical study of giant molecular clouds traced by ${}^{13}$CO, C${}^{18}$O, CS, and CH${}_3$OH in the disk of NGC 1068 based on ALMA observations
• Synthetic CO, H2 and HI surveys of the Galactic 2nd Quadrant, and the properties of molecular gas
• GMCs scaling relations: role of the cloud definition
• What is a GMC? Are Observers and Simulators Discussing the Same Star-forming Clouds?
• The molecular gas mass of M33
• The changing GMC population in galaxy interactions
• ALMA CO Clouds and Young Star Complexes in the Interacting Galaxies IC 2163 and NGC 2207
• Effects of Galactic Disc Inclination and Resolution on Observed GMC Properties and Larson's Scaling Relations
• Rise and fall of molecular clouds across the M33 disk
• Discovery of a Molecular Collision Front in Interacting Galaxies NGC 4567/4568 with ALMA

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• Molecular Cloud Populations in the Context of Their Host Galaxy Environments: A Multiwavelength Perspective
• Does the magnetic field suppress fragmentation in massive dense cores?
• Live Fast, Die Young: GMC lifetimes in the FIRE cosmological simulations of Milky Way-mass galaxies
• The role of galactic dynamics in shaping the physical properties of giant molecular clouds in Milky Way-like galaxies
• Evolution of giant molecular clouds across cosmic time
• Simulations of the star-forming molecular gas in an interacting M51-like galaxy: cloud population statistics
• How do different spiral arm models impact the ISM and GMC population?
• A scaling relation for the molecular cloud lifetime in Milky Way-like galaxies
• Spatial Power Spectra of Dust across the Local Group: No Constraint on Disc Scale Height
• PHANGS-ALMA: Arcsecond CO(2-1) Imaging of Nearby Star-Forming Galaxies
• Interstellar planetesimals: potential seeds for planet formation?
• Reconciling extragalactic star formation efficiencies with theory: insights from PHANGS
• Molecular cloud matching in CO and dust in M33 II. Physical properties of giant molecular clouds
• Stellar Feedback Effects on the Mass Distribution of Clouds and Cloud Complexes